I think I am being quite generous with my rating.
It wasn't awful, although the ending came off as cheesy and forced with some horrible dialogue. I mean worse than normal dialogue. I wouldn't say any of the dialogue in the book is great- it is a group of teenagers talking.
"How do you want your coffee?"
"Black like my soul..."
It kept me turning the pages but there really wasn't anything original in the whole book. I see a lot of different elements in there - Harry Potter, Star Wars (Jace I am your father!), Twilight....
Probably won't continue with the series.